Actually i own Nova 2s, but i'll just share it here because no specific forum for Nova 2s.
After a few days scratching head and crying loud trying to find out why when i open Google Play Store it's just stuck on circular loading screen, i finally came down to the solution.
For all of you who think it's maybe ROM's fault, it's not.
It's pure GApps' fault, specifically it's com.google.android.gms A.K.A Google Play Services.
Not long ago, you can find an app named GMS Installer in HiApp market, and Huawei decided to trash it, so that's why you can't find it anymore in HiApp market.
GMS Installer is the solution for this issue.
Download the GMS Installer and install the APK, open the app, and press One Touch Installation, your device will automatically reboot and automatically install Google Play Services in Huawei eRecovery.
After your device booting back into system, check in Apps if the Google Play Services installed correctly.
After that, you can download the rest from APKMirror : Google Account Manager, Google Calendar Sync, Google Contacts Sync, Google Play Store, and Google Services Framework. Keep in mind you should download version that fit to your android version.
You can even update the Google Play Services to the latest version using the apk's from APKMirror, don't worry it will works.
GMS INSTALLER 1.2.0 :